(* Copyright (C) 2002, HELM Team.
 * 
 * This file is part of HELM, an Hypertextual, Electronic
 * Library of Mathematics, developed at the Computer Science
 * Department, University of Bologna, Italy.
 * 
 * HELM is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * HELM is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HELM; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA  02111-1307, USA.
 * 
 * For details, see the HELM World-Wide-Web page,
 * http://cs.unibo.it/helm/.
 *)

open Printf;;
open Uwobo_common;;

let dump_args keys params props =
  (sprintf "
<h1>Uwobo_engine.apply: not yet implemented!</h1>
Keys: %s<br />
Parameters:<br />
%s
Props: %s<br />
"
    (String.concat ", " keys)
    (String.concat
      "<br />\n"
      (List.map
        (fun key ->
          (sprintf
            "Key: %s, Params: %s"
            key
            (String.concat
              ", "
              (List.map
                (fun (key,value) -> sprintf "%s:%s" key value)
                (params key)))))
        keys))
    (String.concat
      ", "
      (List.map (fun (key,value) -> sprintf "%s:%s" key value) props)))

  (* TODO add global mutex, stylesheets are freezed at the request moment *)
let apply
  ~(logger: Uwobo_logger.processingLogger)
  ~(styles: Uwobo_styles.styles)
  ~keys ~params ~props ~input =
  let stylesheets = styles#get keys in
  logger#log (dump_args keys params props);
  logger#log "Creating input document ...";
  List.fold_left
    (fun source (key, stylesheet) ->
      logger#log (sprintf "Applying stylesheet %s ..." key);
      try
        Gdome_xslt.applyStylesheet ~source ~stylesheet ~params:(params key)
      with e -> raise (Uwobo_failure (Printexc.to_string e)))
    input
    stylesheets